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Proposition d'une nouvelle méthode de transformation de signaux video rvb/hsi. Application aux systèmes de vision couleur temps réel

Abstract : The colorimetric space HSI offers numerous advantages in the analysis and treatment of colour images (H and S attributes insensitive to variations of light setting, perception of colours analogous to those of the eye, robust chromatic segmentations which are weIl adapted to real images). In the meantime, cameras and other image captors deliver the standard RGB signaIs and the RGB->HSI transformation at the rate of video is still far from being mastered (incomplete transfer of space, loss of meaning of the attributes H and S in some zones, aberrations owing to the quantification of the signals upstream). To attempt to resolve sorne of these problems, we have chosen an unconventional method of transformation which results in the development of a mixed electronic structure (analognumeric). All the functions (except the trigonometric relations) necessary.for the conversion are subtained by the broad band analog operators (linear functions, minima tri-signaIs detection, normalization). In this way, the numerization does not appear until the end of the treatment determining the hue. Results of this method are only limited by the signal/noise ratio of the RGB signals on entrance. The improvements obtained in relation to completely digital methods are on one hand, a considerable increase in the chromatic zone of the HSI space; on the other hand, the chromatic/achromatic transition presents improved continuity allowing acceptable colour differentiation even at the low level. Lastly, a final format of 3x8 bits in HSJ olfets a total number of discernable colour analogous to those obtained by a indentical quantification of the RGB cube.
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Martial Grimm. Proposition d'une nouvelle méthode de transformation de signaux video rvb/hsi. Application aux systèmes de vision couleur temps réel. Autre. Université Henri Poincaré - Nancy 1, 1994. Français. ⟨NNT : 1994NAN10322⟩. ⟨tel-01748584⟩

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